CSS Files not loading in Heroku

I am trying to deploy my “Dash Application” on Heroku. But the issue I am facing right now is that my CSS File is not being served from the assets folder to the application.

More specifically,
My assets folder consists of Bootstrap CSS, Bootstrap JS and template.css (Which is my own CSS). Now the issue is Bootstrap files are being served easily but the template.css( Custom CSS) is not getting served.

My Application Github Link: https://github.com/saby9996/parkinson-on-off

In Local though the App works perfectly but facing the issue when deploying it to Heroku.

How App Should Look and is Looking on the Local System

And How it’s looking in Heroku

It would be very much helpful if someone could help.

You have two folders: “Assets” and “assets”.

Just use “assets”.